Github user Syrux commented on a diff in the pull request: https://github.com/apache/spark/pull/17575#discussion_r110662589 --- Diff: mllib/src/test/scala/org/apache/spark/mllib/fpm/PrefixSpanSuite.scala --- @@ -360,6 +360,55 @@ class PrefixSpanSuite extends SparkFunSuite with MLlibTestSparkContext { compareResults(expected, model.freqSequences.collect()) } + test("PrefixSpan pre-processing's cleaning test") { + + // One item per itemSet + val itemToInt1 = (4 to 5).zipWithIndex.toMap + val sequences1 = Seq( + Array(Array(4), Array(1), Array(2), Array(5), Array(2), Array(4), Array(5)), + Array(Array(6), Array(7), Array(8))) + val rdd1 = sc.parallelize(sequences1, 2).cache() + + val cleanedSequence1 = PrefixSpan.toDatabaseInternalRepr(rdd1, itemToInt1).collect() + + val expected1 = Array(Array(0, 4, 0, 5, 0, 4, 0, 5, 0)) + .map(x => x.map(y => { + if (y == 0) 0 --- End diff -- Ok, changing it
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